CN202317166U

CN202317166U - Microbit for printed circuit board

Info

Publication number: CN202317166U
Application number: CN2011204155287U
Authority: CN
Inventors: 廖继源
Original assignee: KUNSHAN KUNZHI ELECTRONIC TOOL Co Ltd
Current assignee: KUNSHAN KUNZHI ELECTRONIC TOOL Co Ltd
Priority date: 2011-10-27
Filing date: 2011-10-27
Publication date: 2012-07-11
Anticipated expiration: 2021-10-27

Abstract

The utility model discloses a microbit for a printed circuit board, which comprises a drill bit head part, a drill bit neck part and a drill bit root part, wherein the drill bit head part, the drill bit neck part and the drill bit root part are integrally formed, two chip eliminating main channels are backwards ground on a drill point of the drill bit head part, two pairs of first knife edges and second edges, which are centrosymmetric at the drill point, are ground between the two chip eliminating main channels, and apex starting point spiral angles of two chip eliminating main channels are the same. The spiral angle of one chip eliminating main channel is maintained unchangeable, the spiral angle of the other chip eliminating main channel is gradually increased, the chip eliminating main channel backwards extends to be converged with another chip eliminating main channel to form a single chip eliminating channel; and the chip eliminating main channel spirally backwards extends until the front end of the root part of the drill bit. The microbit for the printed circuit board, provided by the utility model, is suitable for a punching tool of processing a substrate of the PCB, is generally made of hard alloys, has strong abrasion resistance, and can achieve the effects of being ground for multiple times and being repeatedly used.

Description

The use in printed circuit board microbit

Technical field

The utility model relates to the machining tool of holing on a kind of tellite, is specifically related to a kind of microbit.

Background technology

Tellite generally is to be made up of the thin slice of varnished insulation property resin on paper or the glass fibre and Copper Foil stack; Because will on this tellite, components and parts be installed; The processing so hole, this drill bit are exactly the instrument of on this, processing usefulness, in general in order to reduce cost; Can a plurality of tellite stack be processed together again, so the drill bit appearance that in use the Chang Youkong position is bad, drill bit is lost quality problem.

Chinese patent CN2637048Y disclosed a kind of structure-improved of printed circuit board (PCB) microbit in 09 month on the 01st in 2004; Mainly including brill body and drill point two parts constitutes; The apex point place of this drill point is that Dou has two cutting edges to grinding backward, and each cutting edge extends back along the shaft of drill point and curls up and form chisel edge and chip removal ditch, and drill point extends back in succession in the brill stamen that bores the body body from the apex point front end; Keep one equidistant with the knife-edge of chisel edge, and the front end that bores stamen forms a back taper portion.

Shown in Fig. 1-3, comprise aforementioned Chinese patent, now the two-point bit used of tellite perforation processing (comprises drill bit head 11, drill bit neck 12, drill bit root 13, cutting one sword 14, cutting two swords 15 and cutting slot 18; Drill bit head 11, drill bit neck 12 and drill bit root 13 are one-body molded); Because reach above relatively stricter requirement, so from the tip to the root, 13 two ditches (in Fig. 2, chip removal tap drain I 16 and chip removal tap drain II 17) are arranged all; And the external diameter aspect further reduces again now; Comprehensively have following technical disadvantages: sectional area is less, and rigidity descends, and adds at the multilayer lamination can be easy to generate the phenomenon that fractures man-hour.

The utility model content

To the above-mentioned deficiency of prior art, the utility model technical problem to be solved is to propose a kind of good rigidly, is not easy beat, can effectively reduce the phenomenon that fractures, the use in printed circuit board microbit of position, hole precision in the time of effectively promoting boring.

In order to solve the problems of the technologies described above, the use in printed circuit board microbit that the utility model provides comprises drill bit head, drill bit neck and drill bit root, and drill bit head, drill bit neck and drill bit root are one-body molded; The oblique backward grinding in the apex point place of drill bit head has two chip removal tap drains; Grind between two chip removal tap drains two pairs of first blade and second blades that are centrosymmetric with the apex point place are arranged; The tip starting point spiral angle of two chip removal tap drains is identical; A chip removal tap drain spiral angle remains unchanged, and another chip removal tap drain spiral angle then increases gradually to extend with another chip removal tap drain interflow backward and forms single chip removal ditch, and the chip removal groove continues backward spiral extension until drill bit root front end.

As further improvement, in the above-mentioned use in printed circuit board microbit of the utility model, the tip starting point spiral angle of two chip removal tap drains is 46 ° ± 4 °.

As improvement further, in the above-mentioned use in printed circuit board microbit of the utility model, single chip removal ditch bottom is one dark one shallow chip removal helicla flute.

With respect to prior art, the use in printed circuit board microbit that the utility model provides has following advantage:

1, because groove collaborates to have only a chip removal ditch to drill bit root front end, increases the sectional area of drill bit neck, thereby improved the rigidity of drill bit, be not easy generation and fracture.

2, twice chip removal groove continues the single groove of spiral extension interflow formation backward; Channel bottom be one dark one shallow chip removal helicla flute until drill bit root front end, this structure has the effect of anti-interference stream, smear metal is difficult for being attached in the chip removal groove; Thereby promote the chip removal performance, the qualitative change of hole wall article is good.

The use in printed circuit board microbit structure that the utility model provides is applicable to the drilling tool of PCB aspect substrate processing, generally makes with carbide alloy, has stronger anti-wear performance, can reach and repeatedly grind and reusable effect again.

Description of drawings

Fig. 1 is the structure chart of double cutting drill drill bit common in the prior art.

Fig. 2 is the first end face shape sketch map of double cutting drill drill bit shown in Figure 1.

Fig. 3 is the partial enlarged drawing of A portion among Fig. 1.

Fig. 4 is the first end face shape sketch map of two-point bit shown in Figure 5.

Fig. 5 is the structure chart of the utility model two-point bit.

Fig. 6 is the groove and the sword gauge structure figure of the utility model two-point bit.

Wherein:

11 is drill bit head; 12 is the drill bit neck; 13 is the drill bit root; 14 are cutting one sword; 15 are cutting two swords; 16 are chip removal tap drain I; 17 are chip removal tap drain II; 18 is cutting slot;

31 is drill bit head; 32 is the drill bit neck; 33 is the drill bit root; 34 is first blade; 35 is second blade; 36 are chip removal tap drain I; 37 are chip removal tap drain II; B is single groove; R is a chip removal tap drain helical angle; 38 is cutting slot.

The specific embodiment

Below in conjunction with accompanying drawing and specific embodiment, further set forth the utility model.These embodiment be interpreted as only being used to the utility model is described and be not used in the restriction the utility model protection domain.After the content of having read the utility model record, those skilled in the art can do various changes or modification to the utility model, and these equivalences change and modification falls into the utility model claim institute restricted portion equally.

As shown in Figure 5, in the use in printed circuit board microbit that the utility model preferred embodiment provides, comprise drill bit head 31, drill bit neck 32 and drill bit root 33, drill bit head 31, drill bit neck 32 and drill bit root 33 are one-body molded.

As shown in Figure 4; The oblique backward grinding in the apex point place of drill bit head 31 has two chip removal tap drain chip removal tap drain I 36 and chip removal tap drain II37; Grind between chip removal tap drain I 36 and the chip removal tap drain II37 two pairs of first blade 34 and second blades 35 that are centrosymmetric with the apex point place are arranged; The helical angle R of chip removal tap drain I 36 and chip removal tap drain II37 is 46 ° ± 4 °; Chip removal tap drain I 36 along drill bit head 31 backward spiral extension curl up to drill bit root 32 front ends, chip removal tap drain II37 along drill bit head 31 backward spiral angle then increase spiral extension gradually and curl up to apex point place apart from drill bit head 31, form single groove B until drill bit root 32 front ends.As shown in Figure 6.

Specify the operation principle and the course of action of the utility model below in conjunction with accompanying drawing.

As shown in Figure 6; Under the drill bit duty; The drill bit of rotation is holed on printed circuit board (PCB) through first blade 34 and second blade 35 at a high speed, and the break flour of generation is discharged along one dark one shallow chip removal helicla flute after being pooled to a chip removal ditch through chip removal tap drain I 36 and chip removal tap drain II37 discharge again.

Claims

1. use in printed circuit board microbit; Comprise drill bit head, drill bit neck and drill bit root, drill bit head, drill bit neck and drill bit root are one-body molded, it is characterized in that; The oblique backward grinding in the apex point place of drill bit head has two chip removal tap drains; Grinding between two chip removal tap drains has two pairs of first blade and second blades that are centrosymmetric with the apex point place, and the tip starting point spiral angle of two chip removal tap drains is identical, and a chip removal tap drain spiral angle remains unchanged; Another chip removal tap drain spiral angle then increases gradually to extend with another chip removal tap drain interflow backward and forms single chip removal ditch, and the chip removal groove continues backward spiral extension until drill bit root front end.

2. use in printed circuit board microbit according to claim 1 is characterized in that, the tip starting point spiral angle of described two chip removal tap drains is 46 ° ± 4 °.

3. use in printed circuit board microbit according to claim 1 is characterized in that, described single chip removal ditch bottom is one dark one shallow chip removal helicla flute.